helper.c

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/* -*- C -*- */
/*
 * Copyright (c) 2021 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */
#define M0_TRACE_SUBSYSTEM M0_TRACE_SUBSYS_DTM0
#include "lib/trace.h"
#include "lib/assert.h"
#include "lib/memory.h"
#include "reqh/reqh_service.h"
#include "reqh/reqh.h"               /* m0_reqh */
#include "be/domain.h"
#include "be/dtm0_log.h"
#include "module/instance.h"         /* m0_get */


static int dtm0_log_init(struct m0_be_domain *dom, const char *suffix,
                         const struct m0_buf *data)
{
        struct m0_be_dtm0_log *log0 = *(struct m0_be_dtm0_log**)data->b_addr;
        struct m0_reqh        *reqh = dom->bd_cfg.bc_engine.bec_reqh;
        unsigned               key = m0_get()->i_dtm0_log_key;

        M0_ENTRY("suffix: %s, data: %p, log0: %p", suffix, data->b_addr, log0);

        if (m0_reqh_lockers_get(reqh, key) == NULL)
                m0_reqh_lockers_set(reqh, key, log0);

        return M0_RC(0);
}

static void dtm0_log_fini(struct m0_be_domain *dom, const char *suffix,
                          const struct m0_buf *data)
{
        M0_ENTRY();
        M0_LEAVE();
}

struct m0_be_0type m0_be_dtm0 = {
        .b0_name = "M0_BE:DTM_LOG",
        .b0_init = dtm0_log_init,
        .b0_fini = dtm0_log_fini,
};

M0_INTERNAL int m0_dtm0_log_create(struct m0_sm_group  *grp,
                                   struct m0_be_domain *bedom,
                                   struct m0_be_seg    *seg)
{
        static const char      *logid = "0001";
        struct m0_be_tx_credit  cred = {};
        struct m0_be_dtm0_log  *log;
        struct m0_be_tx        *tx;
        struct m0_buf           data = {};
        int                     rc;

        M0_ALLOC_PTR(tx);
        if (tx == NULL)
                return M0_ERR(-ENOMEM);

        m0_be_0type_add_credit(bedom, &m0_be_dtm0, logid, &data, &cred);
        m0_be_tx_credit_add(&cred, &M0_BE_TX_CREDIT_PTR(log));
        m0_be_dtm0_log_credit(M0_DTML_CREATE, NULL, NULL, seg, NULL, &cred);

        m0_be_tx_init(tx, 0, bedom, grp, NULL, NULL, NULL, NULL);
        m0_be_tx_prep(tx, &cred);
        rc = m0_be_tx_exclusive_open_sync(tx);
        if (rc != 0)
                goto tx_fini;

        rc = m0_be_dtm0_log_create(tx, seg, &log);
        if (rc != 0)
                goto tx_close;

        data = M0_BUF_INIT_PTR(&log);
        rc = m0_be_0type_add(&m0_be_dtm0, bedom, tx, logid, &data);
        if (rc != 0)
                m0_be_dtm0_log_destroy(tx, &log);
tx_close:
        m0_be_tx_close_sync(tx);
tx_fini:
        m0_be_tx_fini(tx);
        m0_free(tx);
        return M0_RC(rc);
}

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */